The Ohio Star is a nine patch block and uses quarter square triangles in its construction.
The basic star has only the edge squares of the nine patch grid replaced with quarter square triangles- clever use of colour gives a square within a square illusion.
Here is a video with this basic variation
You can also replace the corner squares to give a more complex variation as shown here
When the corner squares are replaced with four patches it is sometimes called the Ohio Trail
Here are written instructions for the basic variation from chock-a-block for a 12 inch finished size.
Scissortail Quilting includes example quilt layouts
